Encased Oil Core Microcapsules via Gelation
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Solution Overview
Problem
Existing methods for producing microcapsules with an oil core and a shell suffer from limited operational capacity, poor reproducibility, and inadequate size control, which are critical for pharmaceutical, fragrance, and flavor applications.
Innovation Solution
A method involving a core-forming emulsion with a gelation-inducing agent and a matrix-forming agent, guided through micro-channels to form a water-in-oil-in-water dispersion, where the agents react to create a stable, uniform matrix shell encasing the oil core, allowing for precise control of capsule size and shell thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods for producing microcapsules are used, then the process is simple, but the operational capacity is limited and size control is poor
Solution Approach 1:
The production process is divided into three distinct chambers: a first chamber for core-forming emulsion preparation, a second chamber for dispersion formation, and a third chamber for shell formation. Each chamber performs a specific function, allowing independent optimization of parameters and enabling high operational capacity while maintaining simple, modular equipment design.
Solution Approach 2:
A dispersing agent is introduced as an intermediary substance in the second chamber to facilitate the formation of stable water-in-oil-in-water dispersions. This intermediary enables efficient mass transfer and droplet formation, significantly increasing productivity without requiring complex mechanical systems.
2Manufacturing precision
If existing methods are used, then the equipment is simple, but size control and reproducibility are poor
Solution Approach 1:
The invention precisely controls capsule size by adjusting multiple parameters including the flow rates of emulsion and shell-forming solution, the concentration of gelation-inducing agents, and the physical dimensions of the chambers and channels. This systematic parameter control enables reproducible capsule sizes (coefficient of variation <10%) using relatively simple equipment.
Solution Approach 2:
The core-forming emulsion is prepared in advance in the first chamber with controlled composition and homogeneity before being transferred to the second chamber. This preliminary preparation ensures consistent core properties that directly translate to uniform capsule dimensions, improving manufacturing precision without requiring complex real-time adjustment mechanisms.
3Strength
If shell thickness is increased to improve encapsulation, then protection is enhanced, but release control is reduced
Solution Approach 1:
The shell formation process creates localized variations in shell thickness and composition through controlled addition of shell-forming solution and gelation-inducing agent. Different regions of the shell can have different properties (e.g., thicker sections for enhanced protection, thinner sections for controlled release), allowing simultaneous optimization of both protection and release control.
Solution Approach 2:
The shell formation is a dynamic process where the shell thickness and composition can be controlled by adjusting the rate of shell-forming solution addition and the timing of gelation-inducing agent addition. This dynamic control allows the shell to provide adequate protection while maintaining controlled release properties through precise process parameter management.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances the production capacity to 100 g/h or more, ensures uniform size distribution, and improves encapsulation efficiency, particularly for living organisms, while maintaining the viability and stability of the encapsulated materials.
Implementation Method 1
The gelation-inducing agent and the matrix-forming agent are configured such that they are capable of undergoing a chemical reaction with each other to form a water insoluble matrix shell
Implementation Method 2
Providing in a first chamber a core-forming emulsion comprising or of an aqueous dispersed phase in an oil phase
Implementation Method 3
Guiding the core-forming emulsion from the first chamber through the one or more channels into the second chamber to form a dispersion of the core-forming emulsion in the second aqueous solution
Data Source
AI summary
Disclosed is a method for generating capsules with a matrix shell encasing an oil core. The method includes: providing in a first chamber a core-forming emulsion of an aqueous dispersed phase in an oil phase including water and a dissolved gelation-inducing agent, and a first surfactant; providing in a second chamber a second aqueous solution including water and a second surfactant; wherein the first chamber and the second chamber are fluidically connected by one or more channels; guiding the core-forming emulsion from the first chamber through the channel(s) into the second chamber to form a dispersion of the core-forming emulsion in the aqueous solution; mixing the dispersion with an aqueous shell-forming solution including water and a water soluble matrix-forming agent; and reacting the gelation-inducing agent and the matrix-forming agent in the formed dispersion to form capsules of a water insoluble matrix shell encasing an oil core.